Variable-speed gear.



J. C. MARTINS.

VARIABLE SPEED GEAR.

APPLICATION FILED AUG. 25, 1913.

1,1 12,710. Patented 001$. 6, 1914.

M61 6556 rufenor wmb J 6M.

THE NORRIS PETERS 60.. PHOTO LlTHO" WASHINGTON. D C

UNITED STATES PATENT OFFICE.

JENS CHRISTIAN MARTINS, 0F COPENHAGEN, DENMARK, ASSIGNOR 'IO' TRANSMISSION AKTS, OFCOPENHAGEN, DENMARK.

VARIABLE-SPEED GEAR.

To all whom it may concern Be it known thatI, JE-NS GHRISTIAN MAR- i'nrs, a. subject of the Kingofv Denmark, residing'at Amagerbrogade 102, Copenhagen, Denmark, have invented-certain new. and useful Improvements in-VariablerSpeed Gears, of which the following; is a full, clear, and exact. description.

This invention relates to variable speed gears, and particularly toithe type-inzwhich a set of doubleconical bodies, acting-asplanet-ary'wheels,.engage and roll onv one side on the circumference of flanges or disks nonrotatably fixed on a shaft, and onathe other side en age and roll upon the inner edge of rings keyed to the respectivepulleys. Now. according to the present invention suchvariable speed gears are constructed in such a manner that the planet carrier of one system can be released, whereby theapparatuscan run idly, or can be coupled to one of the pulleysof the apparatus, whereby the direction of'rotation is reversed.

The inventionwill now be more'fully described with reference tozthe accompanying,

drawing in which:

Figure 1' shows a modification of a;gearing according to the invention, partially in longitudinal section. Fig. 2 showsapl'anet carrier, and. Fig; 3 an operating lever.

The shaft 1 carries the flanges 2,1,3, 4, 5, 31

and 4 of'which flanges are connected so as to form one body while all of them by tongue and groove connection are forced to.follow the revolutions of the shaft. All: of the flanges are through the double conical bodies 6 and 7 actedupon by the pressure of the spring 8, so that all of them are forced to rest against these planetary bodies. These latter are journaled in ball bearings 9, which are guided in slots 10 in the rings 11, 12, 13, 14 forming the planet carrier, one of which rings is shown separately in Fig. 2. The ring 11 is by means of groove and tongue connection non-rotatably arranged on the part 15 and thereby to the fixed frame 16. The rings 13 and 14 rest on the ball bearing 17, and finally the ring 12 is by tongue and groove connection made to follow the revolution of the sleeve 18, which by the conical clutch members 19 and 20 in the manner described hereinafter can be secured either to the casing 21, and thus to the outer rings 22, or through the fixed frame 16. The casings or pulleys 21 and 23 rest partly on the Specification of IJetters-.1?aten-t.

Ap plieation filed August 25, 1913:.

Patented- 0:31:; 6; 1914*.

Serial No.1 785,517,

outer rings 22. and; 2.42 and partly 011x ball bearings-.25 and 26..v The" shaft L'With its associated! parts are jpurnaled, in; ball: bear.- 1ngs 27 andi28:v The: rings 22;. and; 24-v are kept at, a' constant. distance from; each: other by the cylindrical body 29eandztherow. of balls 30.., One part of the ball: bearings 28, 1s, a-sshow-n, formeddoy the-boss of; the flange 2, and-the-other pant is fornied-by.v theex-ternally screw threaded sleeve 311,,and thislat, ter can by turning the chain wheel 89=ibe screwed-: forward and baclrW-arddn tliez=fiange 82, fixed.- on, the; fixed: frame 16: The-sleeve 18 is journaled in ball. bearings: 34 andi 35, the cups of which are-formed? by the sleeve 33 :which sleeve; is externally screw threaded anda can be somewhat displaced by rotating it. This rotation.- can be-efi'ectedxby means of a lever 36 (see; Fig. 3). Thebossof the lever formslthe coneof the'ball bearing- 25 and is, connected with the sleeve; 33 through groove and tongueconnection-3'1. AScShOWIl inthe drawing there anetwoiplanet carriers j consisting of rings; 11 andr1-3 and212- an d1;4, jrespectively. These: rings are connected in 'pairsbybolts arranged between the double conical bodies in1holes. 3S,,Fig; 2,.

The apparatus described acts i111 thefol"- l'owlng manner: If: by turning: the lever 3.6

;and thereby the sleeve 33 theclutch member 120 IS! dl'splaoedi until: the: sleeve- 18 is fixed,

the planet. carrier formed byithe rings :12 and E 14 becomes; non-rotatable;. and; the apparatus will then. act: in such. a manner,. that, the

power which is lect toithe pulley'23: is trans-. mitted from the same through the double conical bodies, 6 to the shaft 1,, and therefrom. to the pulley 21. Through transmission of the motion from the pulley to the shaft the direction of rotation is altered, the two pulleys will rotate in the same direction, and the resulting ratio of gearing is equal to the product of the separate ratios of gearing between the pulley 23 and the shaft, and between the latter and the pulley 21, and thus the resulting ratio of gearing may become very great.

In the position of the flanges shown in Fig. 1 the greatest possible ratio of gearing is obtained, it being presumed that the sleeve 18 is by means of the clutch member 20 coupled to the fixed frame 16, the bodies 6 rolling with their smallest diameters onth'e rings 24 and with their reatest diameters, on the flanges 4 and 5, while the bodies 7 roll with their smallest diameters on the flanges 2 and 3, and with their greatest diameters on the rings 22.

If the ratio of gearing is to be altered the chain wheel 39 and thereby the sleeve 31 is turned, which sleeve is thereby screwed out of or into the casing 21. The flange 2 is thereby displaced, whereupon the double conical bodies 7 are forced outward, and the rings 22 will be forced from each other. Owing to the cylindrical body 29 the rings 24 will be brought near to each other and the double conical bodies 6 forced down be tween the flanges 1 and 5, the flange 5 being displaced to the left the same distance as the flange 2, both of them following the movement of the shaft 1. The planet carriers are connected through the ball bearing 17, which is possible because they are always displaced to the same extent and to the same side.

By the displacement effected the bodies 6 have been caused, to roll on the rings 2% with greater diameter than previously on the flanges 1 and 5 with a smaller diameter. The bodies 7 roll at same time with a greater diameter on the flanges 2 and 3 and with a smaller diameter on the rings 22. This infers that the ratio of gearing obtained has become less than in the above named case. If now by turning the lever 36 the sleeve 83 is screwed to the right, the clutch member 20 will be released while the clutch member 19 will come into engagement with the casing 21, and the planet carrier consisting of the rings 12 and 1 1 will be coupled to the casing 21, so that no rolling can take place between the double conical bodies 7 and the rings 22, and thus no rolling either on the flanges 2 and 3. The entire system is coupled togather into one body which follows the revolution of the shaft 1. The direction of rotation being reversed through transmission from the flanges to the outer rings, the pulleys 23 and 21 will now turn in the opposite direction. If the lever 36 is placed in such a position that none of the conical clutch members are in engagement, the planet carrier consisting of the rings 12 and 14 can freely rotate, and no motion is transmitted to the rings 22 or, to the pulley 21, thus idle running takes place.

Having now particularly described and ascertained the nature of the said invention what I claim and desire to secure by Letters Patent of U. S. of America is:

1. Variable speed friction-gearing, comprising a fixed frame, a shaft, flanges displaceably but non-rotatably fixed thereon, two pulleys, rings connected with said pul leys, two planet-carriers one of which is non-rotatably connected with said fixed frame, two sets of double conical bodies adapted to roll between the circumference of said flanges and the inner surfaces of said rings, and means by which the other of said planet-carriers can be coupled to said fixed frame, to one of said pulleys, or be totally uncoupled.

2. Variable speed-friction gearing, comprising a fixed frame, a. shaft, flanges displaceably but non-rotatably fixed thereon, two pulleys, rings connected with said pulleys, two planet carriers one of which is nonrotatably connected with said fixed frame, two sets of double conical bodies adapted to roll between the circumference of said flanges and the inner surfaces of said rings, a sleeve non-rotatably connected with the other of said planet-carriers, and clutchmembers on said sleeve adapted to coact with corresponding clutclrmembers on said fixed frame and on one of said pulleys respectively.

In testimony whereof I affixed my signature in presence of two witnesses.

J ENS CHRISTIAN MARTINS.

Witnesses E. FREDERIKSEN, VIsso BLOM.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents,

Washington, D. Q. 

